What kind of feeling does the poem "The Listeners" by Walter de La Mare create?

This question is asking you about mood—that is, the atmosphere a writer has created in a piece of writing. How does this poem make you feel?
"The Listeners" is one of my favorite poems because of its haunting, mysterious mood. There's a real enigma to it: the central character is unnamed, referred to only as "the Traveller," and we have no idea who he's addressing in the house or what he has promised. "I kept my word," he tells the listeners—but what was this? Has he promised to return to the house? If so, why?
The Listeners themselves, too, are extremely mysterious: part of this is because they remain so silent, keeping their secrets, while part of it is de la Mare's use of words like "phantom" to suggest that they are otherworldly and beyond our explanation. We do not even know whether the Traveller knows they are there, but why else would he go on talking into the silence? The tiny details in the poem also add to the sense of atmosphere: an auditory image is created in the description of how the horse "champed the grasses" in the forest, uninterested in what is going on—he is not disturbed by the Listeners. Meanwhile, the house has evidently been abandoned for a long time and become a home for animals, as is indicated by the rather Gothic image of the owl which "flew out of the turret" over the head of the Traveller.